import cv2


def test1():
    #
    src = cv2.imread('lina.jpg')

    #
    gray_img = cv2.cvtColor(src, cv2.COLOR_BGR2GRAY)

    cv2.imshow('1', src)
    cv2.imshow('2', gray_img)
    cv2.waitKey(0)
    cv2.destroyAllWindows()
